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Hur, C. (author), Ferreira, C. (author), Schepers, J.G. (author)Horizontal axis wind turbines (HAWTs) experience yaw misalignments due to the phy sical limitations of yaw controllers and various novel active yaw controls. Moreover, the motion of floating offshore wind turbines (FOWTs) accelerates yaw misalignment. The blade element mo mentum (BEM) method is widely used due to its computational efficiency for...article 2022
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Mahmoudi, A. (author), Donkers, P.A.J. (author), Walayat, K. (author), Peters, B. (author), Shahi, M. (author)Salt hydrates are promising candidates for the long-term thermochemical heat storage (TCES) in thebuilding environment. In such storage systems, the surplus of energy will be exploited in an endothermicreaction to dehydrate the salt hydrates. Once it is demanded, the stored energy will be released throughan exothermic reaction by hydrating the...article 2021
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Diepstraten, N. (author), Seykens, X.L.J. (author), Somers, L.M.T. (author)High Pressure Direct Injection (HPDI) is a promising combustion concept for the medium- to heavy-duty industry to combat climate change. It uses a pilot diesel injection to ignite the main fuel consisting of Natural Gas (NG). Both fuels are injected directly in the combustion chamber using a dedicated HPDI injector. A significant reduction in...conference paper 2021
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Kozhevnikov, A. (author), Kunnen, R.P.J. (author), van Baars, G.E. (author), Clercx, H.J.H. (author)The recoating step in stereolithography (SL) is one of the principal sources of inaccuracies. The liquid layer deposition on top of irregular topography leads to a non-uniform layer thickness which eventually results in a poor quality of the final product. To compensate the unevenness of the underlying geometry, an approach where the recoating...article 2020
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de Boer, J.G.G.M. (author), Hofmeyer, H. (author), Maljaars, J. (author), van Herpen, R.A.P. (author)A self-supporting sandwich panel facade system under fire is studied. First, a thermomechanical FE model, which comprises the complete facade system, and incorporates material degradation and geometrical nonlinear behaviour except for the insulation material and connections, is loaded by a fire temperature curve. Eurocode design rules then...article 2019
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Yu, W. (author), Tavernier, D. (author), Ferreira, C. (author), van Kuik, G.A.M. (author), Schepers, G. (author)Two new engineering models are presented for the aerodynamic induction of a wind turbine underdynamicthrust.ThemodelsaredevelopedusingthedifferentialformofDuhamelintegrals of indicial responses of actuator disc type vortex models. The time constants of the indicial functions are obtained by the indicial responses of a linearand a...article 2019
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Macchion, O. (author), Belfroid, S.P.C. (author), Stachyra, L. (author), Jensen, A. (author)Computational Fluid Dynamics (CFD) simulations are used to predict the flow-induced forcing in high-pressure multiphase pipe flow. Furthermore, empirical correlations from the literature is compared and validated against computational and experimental results. Based on the CFD results and in conjunction with the reference 6” (internal diameter ...conference paper 2019
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Rahimi, H. (author), Schepers, J.G. (author), Shen, W.Z. (author), Ramos Garcia, N. (author), Schneider, W.S. (author), Micallef, D. (author), Simao Ferreira, C.J. (author), Jost, E. (author), Klein, L. (author), Herraez, I. (author)This work presents an investigation on different methods for the calculation of the angle of attack and the underlying induced velocity on wind turbine blades using data obtained from three-dimensional Computational Fluid Dynamics (CFD). Several methods are examined and their advantages, as well as shortcomings, are presented. The investigations...article 2018
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Rahimi, H. (author), Garcia, A.M. (author), Stoevesandt, B. (author), Peinke, J. (author), Schepers, J.G. (author)This work presents a significantly improved engineering model for the prediction of the loads in yawed flow. The newly developedmodel focuses on the so-called skewedwake effect. This effect leads to an azimuthal variation of the axial induction velocity which depends on the yawangle, tip speed ratio,wind speed, andradial position.Theazimuthal...article 2018
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Dwight, R.P. (author), Desmedt, S.G.L. (author), Shoeibi Omrani, P. (author)Propagation of random variables through computer codes of many inputs is primarily limited by computational expense. The use of sparse grids mitigates these costs somewhat; here we show how Sobol indices can be used to perform dimension adaptivity to mitigate them further. The method is compared to conventional adaptation schemes on sparse grids...bookPart 2016
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Bogerd, C.P. (author), Aerts, J.M. (author), Annaheim, S. (author), Bröde, P. (author), de Bruyne, G. (author), Flouris, A.D. (author), Kuklane, K. (author), Sotto Mayor, T. (author), Rossi, R.M. (author)The thermal effects related to wearing headgear are complex and different studies have investigated single parts of this topic. This review aims at summarizing the different findings to give a complete overview on this topic as well as to suggest new perspectives. Headgear increases head insulation and therefore is mainly problematic under warm...article 2015
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Nikačević, N.M. (author), Thielen, L. (author), Twerda, A. (author), van den Hof, P.M.J. (author)Flow pattern analysis in a spiral Helix reactor is conducted, for the application in commercial surfactant production. Step change response curves (SCR) were obtained from numerical tracer experiments by three-dimensional computational fluid dynamics (CFD) simulations. Non-reactive flow is simulated, though viscosity is treated as variable in...article 2015
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Meschini, D. (author), Busini, V. (author), Van Ratingen, S.W. (author), Rota, R. (author)Nowadays, pollution from traffic remains one of the major sources for contamination in urban areas and it is widely known that substances emitted by vehicles represent a serious hazard to human health; some traffic-related pollutants, such as NO, NOx and CO are responsible for both acute and chronic effects on human health. This is often the...conference paper 2014
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Mack, A. (author), Spruijt, M.P.N. (author)In the present paper, CFD (computational fluid dynamics) computations were performed in order to get insight in heavy gas dispersion behavior based on experimental results and extrapolate them to a representative full bore rupture scenario of a CO2 pipeline. The impact of the release process is investigated on the overall heavy gas dispersion....article 2014
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Nikačević, N.M. (author), Thielen, L. (author), Twerda, A. (author), van den Hof, P.M.J. (author)Flow pattern analysis in a spiral Helix reactor is conducted, for the application in the commercial surfactant production. Step change response curves (SCR) were obtained from numerical tracer experiments by three-dimensional computational fluid dynamics (CFD) simulations. Non-reactive flow is simulated, though viscosity is treated as variable...article 2014
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Antonioni, G. (author), Burkhart, S. (author), Burman, J. (author), Dejoan, A. (author), Fusco, A. (author), Gaasbeek, R. (author), Gjesdal, T. (author), Jäppinen, A. (author), Riikonen, K. (author), Morra, P. (author), Parmhed, O. (author), Santiago, J.L. (author)Chemical plants, refineries, transportation of hazardous materials are some of the most attractive facilities for external attacks aimed at the release of toxic substances. Dispersion of these substances into the atmosphere forms a concentration distribution of airborne pollutants with severe consequences for exposed individuals. For emergency...article 2012
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Trijssenaar, I.J.M. (author), Spruijt, M.P.N. (author), Hulsbosch, C.E.C. (author)Abstract: A large release of Carbon Dioxide (CO2) is modelled with Computational Fluid Dynamics (CFD), (Fluent v12.1). Special attention is given to the modelling of a neutral atmospheric boundary layer (ABL) with gravity. Both the presence of non-vapour CO2 and the high density of CO2 require that the effect of gravity is taken into account....conference paper 2011
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Hulsbosch-Dam, C.E.C. (author), Spruijt, M.P.N. (author), Trijssenaar-Buhre, I.J.M. (author)A large release of Carbon Dioxide (CO<inf>2</inf>) is modelled with Computational Fluid Dynamics (CFD), (Fluent v12.1). Special attention is given to the modelling of a neutral atmospheric boundary layer (ABL) with gravity. Both the presence of non-vapour CO<inf>2</inf> and the high density of CO<inf>2</inf> require that the effect of gravity is...conference paper 2011
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Mediavilla Varas, J. (author), Philippens, M.M.G.M. (author), Meijer, S.R. (author), van den Berg, A.C. (author), Sibma, P.C. (author), van Bree, J.L.M.J. (author), de Vries, D.V.W.M. (author)Shock tube experiments and simulations are conducted with a spherical gelatin filled skull- brain surrogate, in order to study the mechanisms leading to blast induced mild traumatic brain injury. A shock tube including sensor system is optimized to simulate realistic impro-vised explosive device blast profiles obtained from full scale field...article 2011
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García, J. (author), Baraldi, D. (author), Gallego, E. (author), Beccantini, A. (author), Crespo, A. (author), Hansen, O.R. (author), Høiset, S. (author), Kotchourko, A. (author), Makarov, D. (author), Migoya, E. (author), Molkov, V. (author), van der Voort, M.M. (author), Yanez, J. (author), TNO Defensie en Veiligheid (author)Within the HySafe Network of Excellence, several organizations with experience in numerical combustion modeling participated to Standard Benchmark Exercise Problem 2 (SBEP-V2), trying to reproduce numerically the explosion of a stoichiometric hydrogen-air mixture in a 10 m radius balloon. Different codes and models have been applied in the...article 2010
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